User-Level Threads 户级线程
Applications can be designed to have user-level threads that are scheduled to work by the application or by the pthreads scheduler in libpthreads.
应用程序在设计上可拥有多个用户级线程，并将它们计划为由应用程序或libpthread中的pthread调度程序处理。
Threads belonging to a user process run at user privilege level.
属于用户进程的线程运行在用户级权限。
Many modern UNIX operating systems implement a many-to-few model when mapping user-level threads to kernel entities.
很多现代的UNIX操作系统实现了一个多对一的模型，用来映射用户空间的线程到系统内核对象。
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